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Add pdfioFileCreateTemporary function (Issue #29)

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This commit is contained in:
Michael R Sweet
2022-05-15 22:52:53 -04:00
parent f8b471acfd
commit 316b0ad559
8 changed files with 287 additions and 54 deletions
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261
pdfio-file.c
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@ -1,7 +1,7 @@
//
// PDF file functions for PDFio.
//
// Copyright © 2021 by Michael R Sweet.
// Copyright © 2021-2022 by Michael R Sweet.
//
// Licensed under Apache License v2.0. See the file "LICENSE" for more
// information.
@ -264,46 +264,26 @@ pdfioFileCreate(
// Write a standard PDF header...
if (!_pdfioFilePrintf(pdf, "%%PDF-%s\n%%\342\343\317\323\n", version))
{
pdfioFileClose(pdf);
unlink(filename);
return (NULL);
}
goto error;
// Create the pages object...
if ((dict = pdfioDictCreate(pdf)) == NULL)
{
pdfioFileClose(pdf);
unlink(filename);
return (NULL);
}
goto error;
pdfioDictSetName(dict, "Type", "Pages");
if ((pdf->pages_obj = pdfioFileCreateObj(pdf, dict)) == NULL)
{
pdfioFileClose(pdf);
unlink(filename);
return (NULL);
}
goto error;
// Create the info object...
if ((info_dict = pdfioDictCreate(pdf)) == NULL)
{
pdfioFileClose(pdf);
unlink(filename);
return (NULL);
}
goto error;
pdfioDictSetDate(info_dict, "CreationDate", time(NULL));
pdfioDictSetString(info_dict, "Producer", "pdfio/" PDFIO_VERSION);
if ((pdf->info_obj = pdfioFileCreateObj(pdf, info_dict)) == NULL)
{
pdfioFileClose(pdf);
unlink(filename);
return (NULL);
}
goto error;
// Create random file ID values...
_pdfioCryptoMakeRandom(id_value, sizeof(id_value));
@ -315,6 +295,15 @@ pdfioFileCreate(
}
return (pdf);
// Common error handling code...
error:
pdfioFileClose(pdf);
unlink(filename);
return (NULL);
}
@ -535,41 +524,26 @@ pdfioFileCreateOutput(
// Write a standard PDF header...
if (!_pdfioFilePrintf(pdf, "%%PDF-%s\n%%\342\343\317\323\n", version))
{
pdfioFileClose(pdf);
return (NULL);
}
goto error;
// Create the pages object...
if ((dict = pdfioDictCreate(pdf)) == NULL)
{
pdfioFileClose(pdf);
return (NULL);
}
goto error;
pdfioDictSetName(dict, "Type", "Pages");
if ((pdf->pages_obj = pdfioFileCreateObj(pdf, dict)) == NULL)
{
pdfioFileClose(pdf);
return (NULL);
}
goto error;
// Create the info object...
if ((info_dict = pdfioDictCreate(pdf)) == NULL)
{
pdfioFileClose(pdf);
return (NULL);
}
goto error;
pdfioDictSetDate(info_dict, "CreationDate", time(NULL));
pdfioDictSetString(info_dict, "Producer", "pdfio/" PDFIO_VERSION);
if ((pdf->info_obj = pdfioFileCreateObj(pdf, info_dict)) == NULL)
{
pdfioFileClose(pdf);
return (NULL);
}
goto error;
// Create random file ID values...
_pdfioCryptoMakeRandom(id_value, sizeof(id_value));
@ -581,6 +555,13 @@ pdfioFileCreateOutput(
}
return (pdf);
// Common error handling code...
error:
pdfioFileClose(pdf);
return (NULL);
}
@ -657,6 +638,194 @@ pdfioFileCreatePage(pdfio_file_t *pdf, // I - PDF file
}
//
// 'pdfioFileCreateTemporary()' - Create a temporary PDF file.
//
// This function creates a PDF file with a unique filename in the current
// temporary directory. The temporary file is stored in the string "buffer" an
// will have a ".pdf" extension. Otherwise, this function works the same as
// the @link pdfioFileCreate@ function.
//
// @since PDFio v1.1@
//
pdfio_file_t *
pdfioFileCreateTemporary(
char *buffer, // I - Filename buffer
size_t bufsize, // I - Size of filename buffer
const char *version, // I - PDF version number or `NULL` for default (2.0)
pdfio_rect_t *media_box, // I - Default MediaBox for pages
pdfio_rect_t *crop_box, // I - Default CropBox for pages
pdfio_error_cb_t error_cb, // I - Error callback or `NULL` for default
void *error_data) // I - Error callback data, if any
{
pdfio_file_t *pdf; // PDF file
pdfio_dict_t *dict; // Dictionary for pages object
pdfio_dict_t *info_dict; // Dictionary for information object
unsigned char id_value[16]; // File ID value
int i; // Looping var
const char *tmpdir; // Temporary directory
#if _WIN32 || defined(__APPLE__)
char tmppath[256]; // Temporary directory path
#endif // _WIN32 || __APPLE__
unsigned tmpnum; // Temporary filename number
// Range check input...
if (!buffer || bufsize < 32)
{
if (buffer)
*buffer = '\0';
return (NULL);
}
if (!version)
version = "2.0";
if (!error_cb)
{
error_cb = _pdfioFileDefaultError;
error_data = NULL;
}
// Allocate a PDF file structure...
if ((pdf = (pdfio_file_t *)calloc(1, sizeof(pdfio_file_t))) == NULL)
{
pdfio_file_t temp; // Dummy file
char message[8192]; // Message string
temp.filename = (char *)"temporary.pdf";
snprintf(message, sizeof(message), "Unable to allocate memory for PDF file - %s", strerror(errno));
(error_cb)(&temp, message, error_data);
*buffer = '\0';
return (NULL);
}
// Create the file...
#if _WIN32
if ((tmpdir = getenv("TEMP")) == NULL)
{
GetTempPathA(sizeof(tmppath), tmppath);
tmpdir = tmppath;
}
#elif defined(__APPLE__)
if ((tmpdir = getenv("TMPDIR")) != NULL && access(tmpdir, W_OK))
tmpdir = NULL;
if (!tmpdir)
{
// Grab the per-process temporary directory for sandboxed apps...
# ifdef _CS_DARWIN_USER_TEMP_DIR
if (confstr(_CS_DARWIN_USER_TEMP_DIR, tmppath, sizeof(tmppath)))
tmpdir = tmppath;
else
# endif // _CS_DARWIN_USER_TEMP_DIR
tmpdir = "/private/tmp";
}
#else
if ((tmpdir = getenv("TMPDIR")) == NULL || access(tmpdir, W_OK))
tmpdir = "/tmp";
#endif // _WIN32
for (i = 0; i < 1000; i ++)
{
_pdfioCryptoMakeRandom((uint8_t *)&tmpnum, sizeof(tmpnum));
snprintf(buffer, bufsize, "%s/%08x.pdf", tmpdir, tmpnum);
if ((pdf->fd = open(buffer, O_WRONLY | O_BINARY | O_CREAT | O_TRUNC | O_EXCL, 0666)) >= 0)
break;
}
pdf->filename = strdup(buffer);
if (i >= 1000)
{
_pdfioFileError(pdf, "Unable to create file - %s", strerror(errno));
free(pdf->filename);
free(pdf);
*buffer = '\0';
return (NULL);
}
pdf->version = strdup(version);
pdf->mode = _PDFIO_MODE_WRITE;
pdf->error_cb = error_cb;
pdf->error_data = error_data;
pdf->permissions = PDFIO_PERMISSION_ALL;
pdf->bufptr = pdf->buffer;
pdf->bufend = pdf->buffer + sizeof(pdf->buffer);
if (media_box)
{
pdf->media_box = *media_box;
}
else
{
// Default to "universal" size (intersection of A4 and US Letter)
pdf->media_box.x2 = 210.0 * 72.0f / 25.4f;
pdf->media_box.y2 = 11.0f * 72.0f;
}
if (crop_box)
{
pdf->crop_box = *crop_box;
}
else
{
// Default to "universal" size (intersection of A4 and US Letter)
pdf->crop_box.x2 = 210.0 * 72.0f / 25.4f;
pdf->crop_box.y2 = 11.0f * 72.0f;
}
// Write a standard PDF header...
if (!_pdfioFilePrintf(pdf, "%%PDF-%s\n%%\342\343\317\323\n", version))
goto error;
// Create the pages object...
if ((dict = pdfioDictCreate(pdf)) == NULL)
goto error;
pdfioDictSetName(dict, "Type", "Pages");
if ((pdf->pages_obj = pdfioFileCreateObj(pdf, dict)) == NULL)
goto error;
// Create the info object...
if ((info_dict = pdfioDictCreate(pdf)) == NULL)
goto error;
pdfioDictSetDate(info_dict, "CreationDate", time(NULL));
pdfioDictSetString(info_dict, "Producer", "pdfio/" PDFIO_VERSION);
if ((pdf->info_obj = pdfioFileCreateObj(pdf, info_dict)) == NULL)
goto error;
// Create random file ID values...
_pdfioCryptoMakeRandom(id_value, sizeof(id_value));
if ((pdf->id_array = pdfioArrayCreate(pdf)) != NULL)
{
pdfioArrayAppendBinary(pdf->id_array, id_value, sizeof(id_value));
pdfioArrayAppendBinary(pdf->id_array, id_value, sizeof(id_value));
}
return (pdf);
// Common error handling code...
error:
pdfioFileClose(pdf);
unlink(buffer);
*buffer = '\0';
return (NULL);
}
//
// '_pdfioFileFindMappedObj()' - Find a mapped object.
//